Content blocks not functional for multiplacement?

I'm not sure if this is a known exclusion at this point (I didn't see it in any of the documentation?), but it looks like content blocks do not work as expected when using multiplacement. 

You can create the article with the content block, select the other areas for placement….. but only the text is placed in the additional areas - not the content block (so if you update the content block, those additional placements won't update). 

While it's helpful to get the text to the additional placements, this lack of content block functionality makes it WAY less useful to us, than initially expected. 

My current use case is placing an article across multiple brands, that contains a content block. Once it is placed, using this multiplacement feature (ideally), we'd simply just need to update the content block to update all brands.